Thanks for reaching out @charlie_moreno. Let me try to address each of your comments at a time.
I want to register volunteers but not tied to any opportunity, later create an opportunity or several opportunities and registered volunteers can accept or decline the opportunities
There isn’t currently a way to automatically opt-in volunteers to specific opportunities. Your only option is to send them a link to the opportunity and let them sign up if they’re interested.
…send an email to registered volunteers when I create one opportunity
Once someone fills out the form to sign up or express interest, you can email them and the rest of the individuals that have signed up from the edit screen for each opportunity.
Also, is there a simple way to add more fields to the form? or use another plugin for forms?
You can do this using the template system included in the plugin and the plugin’s hooks, but it does involve a decent amount of coding knowledge. Like you mentioned, I’m happy to reach out if you would like a bid for us to do that. Let me know if that’s the case and I’ll email you at the address you provided.
Have a good day.
Jonathan